Armchair



FIG. 1 is a right side perspective view of the armchair showing my new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a left side perspective view thereof; and,

FIG. 5 is a top plan view thereof. 

The ornamental design for armchair, as shown and described. 